CODEWITHSUNDEEP
stringbashcharacter
Khaleal
Khaleal

Reputation: 886

Check if a string contains only specified characters including underscores

I want to receive a string (one word) from the user, with the following criteria: The string may contain only alphabetical characters (aA-zZ) and underscores. Digits and other characters are not allowed.

How may I do this in BASH?

Upvotes: 1

Views: 18406

Answers (1)

lilydjwg
lilydjwg

Reputation: 1713

Use =~ to check a string against a (POSIX extended) regex. See manpages bash(1) and regex(7) for more.

# assume your string is in variable $s
if [[ $s =~ ^[A-Za-z_]+$ ]]; then
  # it matches
else
  # doesn't match
fi

Upvotes: 12

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